[U-Boot] [PATCH] usb_storage: USB storage transfer size increase for xHCI

[Marek Vasut]

On Friday, August 14, 2015 at 02:09:50 PM, Sergei Temerkhanov wrote:
> OK, I'll try to find some time for this. I remember trying it with DCACHE
> disabled but for no luck

Cool, thanks. Btw please stop top-posting ;)

> Regards,
> Sergey
> 
> On Fri, Aug 14, 2015 at 1:42 AM, Marek Vasut <marex at denx.de> wrote:
> > On Thursday, August 13, 2015 at 10:56:27 PM, Sergei Temerkhanov wrote:
> > 
> > Hi!
> > 
> > (please stop top-posting ; please keep the list in the loop)
> > 
> > > Well, when I was working on this, setting large transfer sizes resulted
> > 
> > in,
> > 
> > > AFAIR, xhci_wait_for_event() timeout and changing XHCI_TIMEOUT doesn't
> > > help. This function returns NULL which is being dereferenced somewhere
> > 
> > else
> > 
> > > (I don't remember where exactly), there are several places in the
> > > generic xhci support code where this is possible.
> > 
> > I suspect we might need a quirk for the XHCI instead them (quirk that the
> > controller gets stuck when you try to queue arbitrary number of
> > descriptors).
> > But I wonder, don't you have some cache problems instead ? Try disabling
> > dcache (CONFIG_SYS_DCACHE_OFF) on your machine and see if that fixes the
> > problem .
> > 
> > Best regards,
> > Marek Vasut

Best regards,
Marek Vasut